...I am still unsure if they meant Fairy Tale and misspelled it or meant like...the Fairy Tail anime about a magic guild. I chose the former. While there are plenty of Fairy Tales about mermaids, I chose the Indian Water Lilies from a Dutch theme park.

In that fairy tale a moon fairy and her star children would come down to a lake to dance during the full moon while a witch sang for them. They would have to return to the heavens before dawn, or they'd be stuck on Earth. One night seven of the star children were naughty and the witch convinced them to stay after dawn. They were now stuck and during the day they would be transformed into water lilies. But at night they could dance.